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/*
* PowerNV OPAL Firmware Update Interface
*
* Copyright 2013 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define DEBUG
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/delay.h>
#include <asm/opal.h>
/* FLASH status codes */
#define FLASH_NO_OP -1099 /* No operation initiated by user */
#define FLASH_NO_AUTH -9002 /* Not a service authority partition */
/* Validate image status values */
#define VALIDATE_IMG_READY -1001 /* Image ready for validation */
#define VALIDATE_IMG_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */
/* Manage image status values */
#define MANAGE_ACTIVE_ERR -9001 /* Cannot overwrite active img */
/* Flash image status values */
#define FLASH_IMG_READY 0 /* Img ready for flash on reboot */
#define FLASH_INVALID_IMG -1003 /* Flash image shorter than expected */
#define FLASH_IMG_NULL_DATA -1004 /* Bad data in sg list entry */
#define FLASH_IMG_BAD_LEN -1005 /* Bad length in sg list entry */
/* Manage operation tokens */
#define FLASH_REJECT_TMP_SIDE 0 /* Reject temporary fw image */
#define FLASH_COMMIT_TMP_SIDE 1 /* Commit temporary fw image */
/* Update tokens */
#define FLASH_UPDATE_CANCEL 0 /* Cancel update request */
#define FLASH_UPDATE_INIT 1 /* Initiate update */
/* Validate image update result tokens */
#define VALIDATE_TMP_UPDATE 0 /* T side will be updated */
#define VALIDATE_FLASH_AUTH 1 /* Partition does not have authority */
#define VALIDATE_INVALID_IMG 2 /* Candidate image is not valid */
#define VALIDATE_CUR_UNKNOWN 3 /* Current fixpack level is unknown */
/*
* Current T side will be committed to P side before being replace with new
* image, and the new image is downlevel from current image
*/
#define VALIDATE_TMP_COMMIT_DL 4
/*
* Current T side will be committed to P side before being replaced with new
* image
*/
#define VALIDATE_TMP_COMMIT 5
/*
* T side will be updated with a downlevel image
*/
#define VALIDATE_TMP_UPDATE_DL 6
/*
* The candidate image's release date is later than the system's firmware
* service entitlement date - service warranty period has expired
*/
#define VALIDATE_OUT_OF_WRNTY 7
/* Validate buffer size */
#define VALIDATE_BUF_SIZE 4096
/* XXX: Assume candidate image size is <= 1GB */
#define MAX_IMAGE_SIZE 0x40000000
/* Image status */
enum {
IMAGE_INVALID,
IMAGE_LOADING,
IMAGE_READY,
};
/* Candidate image data */
struct image_data_t {
int status;
void *data;
uint32_t size;
};
/* Candidate image header */
struct image_header_t {
uint16_t magic;
uint16_t version;
uint32_t size;
};
struct validate_flash_t {
int status; /* Return status */
void *buf; /* Candidate image buffer */
uint32_t buf_size; /* Image size */
uint32_t result; /* Update results token */
};
struct manage_flash_t {
int status; /* Return status */
};
struct update_flash_t {
int status; /* Return status */
};
static struct image_header_t image_header;
static struct image_data_t image_data;
static struct validate_flash_t validate_flash_data;
static struct manage_flash_t manage_flash_data;
/* Initialize update_flash_data status to No Operation */
static struct update_flash_t update_flash_data = {
.status = FLASH_NO_OP,
};
static DEFINE_MUTEX(image_data_mutex);
/*
* Validate candidate image
*/
static inline void opal_flash_validate(void)
{
long ret;
void *buf = validate_flash_data.buf;
__be32 size = cpu_to_be32(validate_flash_data.buf_size);
__be32 result;
ret = opal_validate_flash(__pa(buf), &size, &result);
validate_flash_data.status = ret;
validate_flash_data.buf_size = be32_to_cpu(size);
validate_flash_data.result = be32_to_cpu(result);
}
/*
* Validate output format:
* validate result token
* current image version details
* new image version details
*/
static ssize_t validate_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct validate_flash_t *args_buf = &validate_flash_data;
int len;
/* Candidate image is not validated */
if (args_buf->status < VALIDATE_TMP_UPDATE) {
len = sprintf(buf, "%d\n", args_buf->status);
goto out;
}
/* Result token */
len = sprintf(buf, "%d\n", args_buf->result);
/* Current and candidate image version details */
if ((args_buf->result != VALIDATE_TMP_UPDATE) &&
(args_buf->result < VALIDATE_CUR_UNKNOWN))
goto out;
if (args_buf->buf_size > (VALIDATE_BUF_SIZE - len)) {
memcpy(buf + len, args_buf->buf, VALIDATE_BUF_SIZE - len);
len = VALIDATE_BUF_SIZE;
} else {
memcpy(buf + len, args_buf->buf, args_buf->buf_size);
len += args_buf->buf_size;
}
out:
/* Set status to default */
args_buf->status = FLASH_NO_OP;
return len;
}
/*
* Validate candidate firmware image
*
* Note:
* We are only interested in first 4K bytes of the
* candidate image.
*/
static ssize_t validate_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct validate_flash_t *args_buf = &validate_flash_data;
if (buf[0] != '1')
return -EINVAL;
mutex_lock(&image_data_mutex);
if (image_data.status != IMAGE_READY ||
image_data.size < VALIDATE_BUF_SIZE) {
args_buf->result = VALIDATE_INVALID_IMG;
args_buf->status = VALIDATE_IMG_INCOMPLETE;
goto out;
}
/* Copy first 4k bytes of candidate image */
memcpy(args_buf->buf, image_data.data, VALIDATE_BUF_SIZE);
args_buf->status = VALIDATE_IMG_READY;
args_buf->buf_size = VALIDATE_BUF_SIZE;
/* Validate candidate image */
opal_flash_validate();
out:
mutex_unlock(&image_data_mutex);
return count;
}
/*
* Manage flash routine
*/
static inline void opal_flash_manage(uint8_t op)
{
struct manage_flash_t *const args_buf = &manage_flash_data;
args_buf->status = opal_manage_flash(op);
}
/*
* Show manage flash status
*/
static ssize_t manage_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct manage_flash_t *const args_buf = &manage_flash_data;
int rc;
rc = sprintf(buf, "%d\n", args_buf->status);
/* Set status to default*/
args_buf->status = FLASH_NO_OP;
return rc;
}
/*
* Manage operations:
* 0 - Reject
* 1 - Commit
*/
static ssize_t manage_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
uint8_t op;
switch (buf[0]) {
case '0':
op = FLASH_REJECT_TMP_SIDE;
break;
case '1':
op = FLASH_COMMIT_TMP_SIDE;
break;
default:
return -EINVAL;
}
/* commit/reject temporary image */
opal_flash_manage(op);
return count;
}
/*
* OPAL update flash
*/
static int opal_flash_update(int op)
{
struct opal_sg_list *list;
unsigned long addr;
int64_t rc = OPAL_PARAMETER;
if (op == FLASH_UPDATE_CANCEL) {
pr_alert("FLASH: Image update cancelled\n");
addr = '\0';
goto flash;
}
list = opal_vmalloc_to_sg_list(image_data.data, image_data.size);
if (!list)
goto invalid_img;
/* First entry address */
addr = __pa(list);
flash:
rc = opal_update_flash(addr);
invalid_img:
return rc;
}
/* Return CPUs to OPAL before starting FW update */
static void flash_return_cpu(void *info)
{
int cpu = smp_processor_id();
if (!cpu_online(cpu))
return;
/* Disable IRQ */
hard_irq_disable();
/* Return the CPU to OPAL */
opal_return_cpu();
}
/* This gets called just before system reboots */
|